Concrete-culvert form.



R. J. BURNS.

' CONCRETE CULVERT FORM. APPLICATION FILED OCT-12.1911- RENEWED SEPT. 13, 1916.

1,224,900; Patented May 8,1917.

WITNESSES l/VVE/VTOR M (916583; 5557725 UNTTED %TATE% PATENT @FFTQE ROBERT J. BURNS, 0F HEWITT, OKLAHOI'EA.

CONCRETE-CULVERT FORM.

1,2%ell,900.

Application filed October 12, 1811, Serial No. 654,385.

To all whom it may concern:

Be it known that T, Roninrr J. BURNS, a citizen of the United States, and a resident of Hewitt, in the county of Carter and State 01 Oklahoma, have invented certain new and useful Improvements in Concrete-Culvert Forms, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to forms for molding concrete culverts, conduits, and the like in swim and aims primarily to provide a form tor this purpose which may be readily re moved, when the concrete becomes sufficiently set, without danger of injuring the finished structure.

The molding form of the present inven tion embodies an expansible and collapsible core adapted for arrangement within a sheet metal sheath which is also expansible and collapsible, and the invention-contemplates forming this core in sections and hingedly mounting upon one of the sections a member arranged to be swung to extend between the section with which it is connected and the opposite one of the sections, whereby to hold the sections of the core in expanded re lation while the concrete is being poured around the form.

.VVith these and other objects in view the present invention consists in the combination and arrangement of parts as will be hereinafter more fully described and finally pointed out in the appended claim, it being further understood that changes in the specific structure shown and described may be made within the scope of the claim, without de parting from the spirit of the invention.

In the accompanying drawings forming a part of this specification and in which like numerals of reference indicate similar parts in the several views:

Figure 1, is a perspective view illustrating the manner of using the form embodying the present invention.

Fig. 2, is a view in end elevation of the form, the same being shown in full lines in expanded condition and in dotted lines in collapsed condition.

Fig. 3, is a vertical longitudinal sectional view through the form, in condition before removal from the completed structure.

In the drawings, the core of the molding form is illustrated as consisting of three sections which are hingedly connected so that they may be expanded or collapsed, although Specification of Letters Patent.

Renewed. September 13, 1916. Serial No. 119,978.

it will be readily understood that more than three sections may be employed if desired. 01 these sections, the top one is indicated by the numeral 1, and the two side sections by the numerals 2 and 8. As shown the three sections have the flattened stop shoulders a extending at right angles to their bases. The side sections 2 and 3, are hinged at their upper edges as at 1, to the lower edges of the top sections 1, all of the sections being of segmental form with their convex sides presented outwardly and the hinges l, having their leaves secured to the chordal sides of the sections whereby the sections 2 and 3, may be swung inwardly to collapse the core. At one end each side section has a rectangular seat Z) to receive a stop shoulder a as shown in Fig. 2. The section 3 further has a projecting ear G. The complete core consists of two or more sets of the sections above described, together with the expanding section to be presently described, and these sets of sections are held in spaced relation by means of a cleat 5, which is secured at its ends to the intermediate portions of the top sections 1, of each set, as clearly shown in Figs. 2 and 3, of the drawings.

The expanding member of the core'consists of the arms 6, one of which is hinged at one end to each of the sections 2, at the lower end of the latter, and these arms are connected by means of a cleat 7, secured at its ends as at 8, to the said arms between their ends. The hinges connecting these arms with the sections 2, are indicated by the numeral 9, and are located in a position corresponding to the hinges which connect the sections 1, 2 and 3. The arm is adapted to rest upon the ear 0.

The core above described is arranged within a sheet metal sheath 11, which preferably consists of a single sheet bent to substantially cylindrical form with its edge portions overlapped, as indicated by the numeral 10, the body portion of the sheath being arranged to be snugly held to the members 1, 2, and 3. The overlapped portions 10, of the sheath are preferably fiat, as shown in Fig. 2, of the drawings, and when the sheath and core are assembled, underlie the expanding member 6, of the core. At this point it may be stated that the sheath has a normal tendency to contract beyond its condition illustrated in dotted lines in Fig. 2, of the drawings.

In using the form, the core thereof is placed within the sheath 11, the sections 1, 2 and 3, and the expanding section of the core being in about the relation shown in dotted lines in Fig. 2, of the drawings. The eX- panding section is then swung downwardly until the free ends of its arms 6, bear against the lower edge portion of the chordal side of the section 3, as illustrated in full lines in Fig. 2, of the drawings. The movement of the expanding section to this position Will result in a spreading of the core to expand the sheath to proper form, to mold the inerior of the culvert or the like. The 0011- crote of which the culvert is to be formed is then poured or applied about the exterior of the sheath and allowed to set. After it has become sui'liciently hard, the expanding section of the core is swung upwardly to allow the core to collapse and be removed, after which the sheath may also be removed.

Having thus described my said invention, what I claim as new and desire to secure by United States Letters Patent is:

A culvert form including in combination, a segmentalshaped top section ending in two flat stop shoulders at right angles to its base, of two segmental side sections each at one end having a rectangular seat to receive a stop shoulder, one of said side members having a projecting ear at one end, hinges to connect said side sections to said top sections whereby said side sections may be swung inward, an arm, a hinge to secure said arm to one of said side sections whereby the end of said arm may be made to rest upon said projecting ear, and a semi-cylindrical sheet metal sheath held to said sections having its edges over-lapped and removably held below said arm, as and in the manner disclosed.

In testlmony whereof I afiix my signature, in presence of two witnesses.

ROBERT J. BURNS. VVlllIlGSSGS JONATHAN C. HoUsn'roN, OLLIE S. BAILEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

